diff --git a/schema/schema.json b/schema/schema.json
index dca8c546..5039eb3d 100644
--- a/schema/schema.json
+++ b/schema/schema.json
@@ -72,54 +72,7 @@
           "type": "string"
         },
         "ownership": {
-          "additionalProperties": false,
-          "properties": {
-            "certificate": {
-              "enum": [
-                "a",
-                "b",
-                "c",
-                "d"
-              ],
-              "type": "string"
-            },
-            "noticeGiven": {
-              "type": "boolean"
-            },
-            "owners": {
-              "items": {
-                "additionalProperties": false,
-                "properties": {
-                  "address": {
-                    "anyOf": [
-                      {
-                        "$ref": "#/definitions/AddressInput"
-                      },
-                      {
-                        "type": "string"
-                      }
-                    ]
-                  },
-                  "name": {
-                    "type": "string"
-                  },
-                  "noticeDate": {
-                    "$ref": "#/definitions/Date"
-                  }
-                },
-                "required": [
-                  "name",
-                  "address"
-                ],
-                "type": "object"
-              },
-              "type": "array"
-            }
-          },
-          "required": [
-            "certificate"
-          ],
-          "type": "object"
+          "$ref": "#/definitions/Ownership"
         },
         "siteContact": {
           "$ref": "#/definitions/SiteContact"
@@ -162,39 +115,7 @@
       "description": "Information about this planning application",
       "properties": {
         "declaration": {
-          "additionalProperties": false,
-          "properties": {
-            "accurate": {
-              "type": "boolean"
-            },
-            "connection": {
-              "additionalProperties": false,
-              "properties": {
-                "description": {
-                  "type": "string"
-                },
-                "value": {
-                  "enum": [
-                    "employee",
-                    "relation.employee",
-                    "electedMember",
-                    "relation.electedMember",
-                    "none"
-                  ],
-                  "type": "string"
-                }
-              },
-              "required": [
-                "value"
-              ],
-              "type": "object"
-            }
-          },
-          "required": [
-            "accurate",
-            "connection"
-          ],
-          "type": "object"
+          "$ref": "#/definitions/ApplicationDeclaration"
         },
         "fee": {
           "$ref": "#/definitions/ApplicationFee"
@@ -213,6 +134,43 @@
       ],
       "type": "object"
     },
+    "ApplicationDeclaration": {
+      "$id": "#ApplicationDeclaration",
+      "additionalProperties": false,
+      "description": "Declarations about the accuracy of this application and any personal connections to the receiving authority",
+      "properties": {
+        "accurate": {
+          "type": "boolean"
+        },
+        "connection": {
+          "additionalProperties": false,
+          "properties": {
+            "description": {
+              "type": "string"
+            },
+            "value": {
+              "enum": [
+                "employee",
+                "relation.employee",
+                "electedMember",
+                "relation.electedMember",
+                "none"
+              ],
+              "type": "string"
+            }
+          },
+          "required": [
+            "value"
+          ],
+          "type": "object"
+        }
+      },
+      "required": [
+        "accurate",
+        "connection"
+      ],
+      "type": "object"
+    },
     "ApplicationFee": {
       "$id": "#ApplicationFee",
       "additionalProperties": false,
@@ -940,54 +898,7 @@
           "type": "string"
         },
         "ownership": {
-          "additionalProperties": false,
-          "properties": {
-            "certificate": {
-              "enum": [
-                "a",
-                "b",
-                "c",
-                "d"
-              ],
-              "type": "string"
-            },
-            "noticeGiven": {
-              "type": "boolean"
-            },
-            "owners": {
-              "items": {
-                "additionalProperties": false,
-                "properties": {
-                  "address": {
-                    "anyOf": [
-                      {
-                        "$ref": "#/definitions/AddressInput"
-                      },
-                      {
-                        "type": "string"
-                      }
-                    ]
-                  },
-                  "name": {
-                    "type": "string"
-                  },
-                  "noticeDate": {
-                    "$ref": "#/definitions/Date"
-                  }
-                },
-                "required": [
-                  "name",
-                  "address"
-                ],
-                "type": "object"
-              },
-              "type": "array"
-            }
-          },
-          "required": [
-            "certificate"
-          ],
-          "type": "object"
+          "$ref": "#/definitions/Ownership"
         },
         "siteContact": {
           "$ref": "#/definitions/SiteContact"
@@ -1965,7 +1876,9 @@
       "type": "object"
     },
     "LondonDetails": {
+      "$id": "#LondonDetails",
       "additionalProperties": false,
+      "description": "Proposal details for project sites within the Greater London Authority (GLA) area",
       "properties": {
         "extend": {
           "additionalProperties": false,
@@ -2605,7 +2518,7 @@
     "LondonProperty": {
       "$id": "#LondonProperty",
       "additionalProperties": false,
-      "description": "Property details for sites within London",
+      "description": "Property details for sites within the Greater London Authority (GLA) area",
       "properties": {
         "EPC": {
           "additionalProperties": false,
@@ -2676,6 +2589,7 @@
           "type": "array"
         },
         "region": {
+          "const": "London",
           "type": "string"
         },
         "titleNumber": {
@@ -2952,6 +2866,58 @@
       ],
       "type": "object"
     },
+    "Ownership": {
+      "$id": "#Ownership",
+      "additionalProperties": false,
+      "description": "Information about the ownership certificate and owners, if different than the applicant",
+      "properties": {
+        "certificate": {
+          "enum": [
+            "a",
+            "b",
+            "c",
+            "d"
+          ],
+          "type": "string"
+        },
+        "noticeGiven": {
+          "type": "boolean"
+        },
+        "owners": {
+          "items": {
+            "additionalProperties": false,
+            "properties": {
+              "address": {
+                "anyOf": [
+                  {
+                    "$ref": "#/definitions/AddressInput"
+                  },
+                  {
+                    "type": "string"
+                  }
+                ]
+              },
+              "name": {
+                "type": "string"
+              },
+              "noticeDate": {
+                "$ref": "#/definitions/Date"
+              }
+            },
+            "required": [
+              "name",
+              "address"
+            ],
+            "type": "object"
+          },
+          "type": "array"
+        }
+      },
+      "required": [
+        "certificate"
+      ],
+      "type": "object"
+    },
     "PlanningConstraint": {
       "$id": "#PlanningConstraint",
       "anyOf": [
@@ -17193,16 +17159,7 @@
           "type": "object"
         },
         "date": {
-          "additionalProperties": false,
-          "properties": {
-            "completion": {
-              "$ref": "#/definitions/Date"
-            },
-            "start": {
-              "$ref": "#/definitions/Date"
-            }
-          },
-          "type": "object"
+          "$ref": "#/definitions/ProposalDates"
         },
         "description": {
           "type": "string"
@@ -17223,6 +17180,20 @@
       ],
       "type": "object"
     },
+    "ProposalDates": {
+      "$id": "#ProposalDates",
+      "additionalProperties": false,
+      "description": "When the proposed works will start and be completed by, not required for all application types",
+      "properties": {
+        "completion": {
+          "$ref": "#/definitions/Date"
+        },
+        "start": {
+          "$ref": "#/definitions/Date"
+        }
+      },
+      "type": "object"
+    },
     "ProposalDetails": {
       "$id": "#ProposalDetails",
       "anyOf": [
@@ -18037,7 +18008,7 @@
           "type": "array"
         },
         "region": {
-          "type": "string"
+          "$ref": "#/definitions/UKRegion"
         },
         "type": {
           "$ref": "#/definitions/PropertyType"
@@ -18051,6 +18022,22 @@
       ],
       "type": "object"
     },
+    "UKRegion": {
+      "$id": "#UKRegion",
+      "description": "UK regions sourced from planning.data.gov.uk/dataset/region, where London is a proxy for the Greater London Authority (GLA) area",
+      "enum": [
+        "North East",
+        "North West",
+        "Yorkshire and The Humber",
+        "East Midlands",
+        "West Midlands",
+        "East of England",
+        "London",
+        "South East",
+        "South West"
+      ],
+      "type": "string"
+    },
     "URL": {
       "format": "uri",
       "pattern": "^https?://",
diff --git a/types/enums/PropertyTypes.ts b/types/enums/PropertyTypes.ts
index b3169405..037757d4 100644
--- a/types/enums/PropertyTypes.ts
+++ b/types/enums/PropertyTypes.ts
@@ -1,5 +1,5 @@
 /**
- * Values of `data.property.type`
+ * Values of `data.property.type`, derived from Basic Land and Property Unit (BLPU) classification codes
  */
 export const PropertyTypes = {
   commercial: 'Commercial',
diff --git a/types/schema/data/Applicant.ts b/types/schema/data/Applicant.ts
index bbb81d0c..5e8477ad 100644
--- a/types/schema/data/Applicant.ts
+++ b/types/schema/data/Applicant.ts
@@ -14,20 +14,26 @@ export type Applicant = BaseApplicant | Agent;
 export interface BaseApplicant {
   type: 'individual' | 'company' | 'charity' | 'public' | 'parishCouncil';
   interest?: 'owner.sole' | 'owner.co' | 'tenant' | 'occupier' | 'other';
-  ownership?: {
-    certificate: 'a' | 'b' | 'c' | 'd';
-    noticeGiven?: boolean;
-    owners?: {
-      name: string;
-      address: AddressInput | string;
-      noticeDate?: Date;
-    }[];
-  };
+  ownership?: Ownership;
   contact: UserContact;
   address: UserAddress;
   siteContact: SiteContact;
 }
 
+/**
+ * @id #Ownership
+ * @description Information about the ownership certificate and owners, if different than the applicant
+ */
+export interface Ownership {
+  certificate: 'a' | 'b' | 'c' | 'd';
+  noticeGiven?: boolean;
+  owners?: {
+    name: string;
+    address: AddressInput | string;
+    noticeDate?: Date;
+  }[];
+}
+
 /**
  * @id #Agent
  * @description Information about the user who completed the application on behalf of someone else
diff --git a/types/schema/data/Application.ts b/types/schema/data/Application.ts
index f7a4aa9c..6e6b1648 100644
--- a/types/schema/data/Application.ts
+++ b/types/schema/data/Application.ts
@@ -8,18 +8,7 @@ import {Date} from '../../utils';
 export interface Application {
   type: ApplicationType;
   fee: ApplicationFee;
-  declaration: {
-    accurate: boolean;
-    connection: {
-      value:
-        | 'employee'
-        | 'relation.employee'
-        | 'electedMember'
-        | 'relation.electedMember'
-        | 'none';
-      description?: string;
-    };
-  };
+  declaration: ApplicationDeclaration;
   preApp?: PreApplication;
 }
 
@@ -45,6 +34,23 @@ export interface ApplicationFee {
   };
 }
 
+/**
+ * @id #ApplicationDeclaration
+ * @description Declarations about the accuracy of this application and any personal connections to the receiving authority
+ */
+export interface ApplicationDeclaration {
+  accurate: boolean;
+  connection: {
+    value:
+      | 'employee'
+      | 'relation.employee'
+      | 'electedMember'
+      | 'relation.electedMember'
+      | 'none';
+    description?: string;
+  };
+}
+
 /**
  * @id #PreApplication
  * @description Details of the pre-application, if applicable
diff --git a/types/schema/data/Property.ts b/types/schema/data/Property.ts
index 483183fb..132a558e 100644
--- a/types/schema/data/Property.ts
+++ b/types/schema/data/Property.ts
@@ -9,13 +9,28 @@ import {Area, URL} from '../../utils';
  */
 export type Property = UKProperty | LondonProperty;
 
+/**
+ * @id #UKRegion
+ * @description UK regions sourced from planning.data.gov.uk/dataset/region, where London is a proxy for the Greater London Authority (GLA) area
+ */
+export type UKRegion =
+  | 'North East'
+  | 'North West'
+  | 'Yorkshire and The Humber'
+  | 'East Midlands'
+  | 'West Midlands'
+  | 'East of England'
+  | 'London'
+  | 'South East'
+  | 'South West';
+
 /**
  * @id #UKProperty
  * @description Property details for sites anywhere in the UK
  */
 export interface UKProperty {
   address: ProposedAddress | OSAddress;
-  region: string;
+  region: UKRegion;
   localAuthorityDistrict: string[];
   type: PropertyType;
   boundary?: {
@@ -29,9 +44,10 @@ export interface UKProperty {
 
 /**
  * @id #LondonProperty
- * @description Property details for sites within London
+ * @description Property details for sites within the Greater London Authority (GLA) area
  */
 export interface LondonProperty extends UKProperty {
+  region: Extract<UKRegion, 'London'>;
   titleNumber: {
     known: 'Yes' | 'No';
     number?: string;
diff --git a/types/schema/data/Proposal.ts b/types/schema/data/Proposal.ts
index 38a42031..77a0caeb 100644
--- a/types/schema/data/Proposal.ts
+++ b/types/schema/data/Proposal.ts
@@ -14,13 +14,19 @@ export interface Proposal {
     site: GeoJSON;
     area: Area;
   };
-  date?: {
-    start?: Date;
-    completion?: Date;
-  };
+  date?: ProposalDates;
   details?: ProposalDetails;
 }
 
+/**
+ * @id #ProposalDates
+ * @description When the proposed works will start and be completed by, not required for all application types
+ */
+export interface ProposalDates {
+  start?: Date;
+  completion?: Date;
+}
+
 /**
  * @id #ProposalDetails
  * @description Details about the changes being proposed
@@ -41,6 +47,10 @@ export interface BaseDetails {
   };
 }
 
+/**
+ * @id #LondonDetails
+ * @description Proposal details for project sites within the Greater London Authority (GLA) area
+ */
 export interface LondonDetails extends BaseDetails {
   vehicleParking: {
     type: VehicleParking[];